Lustfull thoughts are running my life

It doesn't fail, everytime I see a beautiful women the first thing that comes to mind is I want to get in her pants. I am married and know it is wrong, I pray for strength and guidence everyday, and it is getting better, but he problem is still there. The other lustfull problem I have, is I have a 14 year old stepdaughter and I fight the impure thoughts I have about her. I catch myself sneaking a peak down her top, or start to fantasize about her. In the past I took her underwear and masterbated with them, Imagining how it would be to explore her young body. I pray everyday through out the day for Jesus to guide and help me with this problem. In the past week or so it has gotten a little better. I know with all those years of being away from the church I let so much negitive into my life that it is going to take time to replace it with spiritual thoughts. I just pray and wish it would stop.